Decays of the light hybrid meson 1−+

Daylan Esmer, Göksel; Azizi, Kazım; Sundu Pamuk, Hayriye; Türkmen, Saliha

Decays of the light hybrid meson 1−+

Daylan Esmer G., Azizi K., Sundu Pamuk H., Türkmen S.

Physical Review D, vol.111, no.3, pp.34-41, 2025 (Peer-Reviewed Journal)

Publication Type: Article / Article
Volume: 111 Issue: 3
Publication Date: 2025
Journal Name: Physical Review D
Page Numbers: pp.34-41
Istanbul University Affiliated: Yes

Abstract

The full width of the light isovector hybrid meson $𝐻 V$ with spin-parities $1 - +$ and content $(¯ 𝑢 𝑔 𝑢 - ¯ 𝑑 𝑔 𝑑) / \sqrt 2$ is evaluated by considering the decays $𝐻 V \to 𝜌 \pm 𝜋 \mp$ , $𝑏 \pm 1 𝜋 \mp$ , $𝑓 1 (1285) 𝜋$ , $𝑓 1 (1420) 𝜋$ , $𝜂 𝜋$ , and $𝜂' 𝜋$ . To calculate the partial widths of these channels, we use the quantum chromodynamics (QCD) three-point sum rule method which is necessary to determine strong couplings at the corresponding hybrid-meson-meson vertices. It turns out that the main contribution to the full width $Γ [𝐻 V] = (109.7 \pm 16.0) M e V$ of the hybrid meson comes from the processes $𝐻 V \to 𝜌 \pm 𝜋 \mp$ partial width of which amounts to $\approx 67 M e V$ . The effects of the decays $𝐻 V \to 𝑏 1 𝜋$ and $𝐻 V \to 𝑓 1 𝜋, 𝑓' 1 𝜋$ are also sizeable: Their partial widths are equal to 13 MeV and 20 MeV, respectively. The decays to $𝜂 𝜋$ and $𝜂' 𝜋$ mesons are subdominant reactions, nevertheless they form $\approx 9 %$ of the full width $Γ [𝐻 V]$ . Results obtained in this work may be interesting to unravel the tangle of predictions about $𝐻 V$ existing in the literature, as well as useful in analyses of different resonances.